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Study on preparation of cementitious materials from raw phosphogypsum cured by hemihydrate phosphogypsum and their properties
Received date: 2021-10-11
Online published: 2022-06-22
Using raw phosphogypsum（RPG） as the base material，the influence law and action mechanism of the relative content of raw phosphogypsum（RPG） and β-hemihydrate phosphogypsum（HPG） and the three admixtures of quicklime，cement and silica fume on the compressive strength，flexural strength and softening coefficient of phosphogypsum?based composite cementitious materials（PGBM） were studied by single factor experiment.The results showed that the increase of the relative content of HPG，quicklime，cement and silica fume could effectively increase the strength and softening coefficient of PGBM，and silica fume had the most obvious effect.However，when the content of quicklime and cement（calculated by mass fraction） was greater than 4% and 6%，the water resistance of PGBM was not improved significantly.When the mass fraction radio of RPG and HPG was 7∶3，and the content of quicklime，cement and silica fume（calculated by mass fraction） were 4%，12% and 5% respectively，the 28 d compressive strength and softening coefficient of the specimen could reach 26.29 MPa and 0.79 respectively.The microscopic analysis showed that each admixture mainly affected the contact strength between the RPG particles through the filling rate of the hydration product，which in turn affected the strength and water resistance of the PGBM.
Rusong FU , Yuexian LU , Hongfang AN , Dewen KONG , Rubin FU . Study on preparation of cementitious materials from raw phosphogypsum cured by hemihydrate phosphogypsum and their properties[J]. Inorganic Chemicals Industry, 2022 , 54(6) : 109 -114 . DOI: 10.19964/j.issn.1006-4990.2021-0530
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